Dick Smith & Tandy have dual sim card mobile phones on special for $297 (outright purchase). It will take 2 sim cards at the one time & you can switch back & forth between sim cards as you wish. Ideal for home phone to receive messages & use Bali Sim whilst in Bali without the need for 2 phones. It also promises 500 hours standby time & 8 hours talk time.
Phone is called a Hummer HT2.